Angular 2表单验证，minLength验证器不起作用 [英] Angular 2 form validation, minLength validator is not working

问题描述

我有以下Angular 2形式:

I have following Angular 2 form:

<register>
    <form [ngFormModel] = "registrationForm">
        <div class = "form-group">
            <label class = "control-label" for="email">Email</label>
            <input class = "form-control" type="email" id="email" ngControl="email" #email="ngForm">
        </div>
        <div *ngIf = "email.touched && email.errors">
            <div *ngIf = "!email.errors.required && email.errors.underscoreNotFound" class = "alert alert-danger">
                <span>Underscore is required</span> 
            </div>
            <div *ngIf = "email.errors.required" class = "alert alert-danger">
                <span>Email is required</span>
            </div>
        </div>
        <div class = "form-group">
            <label class = "control-label" for="password">Password</label>
            <input class = "form-control" type="password" id="password" ngControl="password" #password="ngForm">
        </div>
        <div *ngIf = "password.touched && password.errors">
            <div *ngIf = "password.errors.minLength && !password.errors.required" class = "alert alert-danger">
                <span>Password should contain 6 characters</span>
            </div>  
            <div *ngIf = "password.errors.required" class = "alert alert-danger">
                <span>Password is required</span>
            </div>          
        </div>
    </form>
</register>

这是我实现验证器的组件:

This is my Component where I have implemented validators:

import {Component} from '@angular/core';
import {Control, ControlGroup, FormBuilder, Validators} from '@angular/common';
import {CustomValidator} from './CustomValidator';

@Component({
    selector: 'register',
    templateUrl: './app/authentication/register_validation/register.html',
})

export class RegisterComponent{
    registrationForm: ControlGroup;

    constructor(formBuilder:FormBuilder)
    {
        this.registrationForm = formBuilder.group({
            email: ['',Validators.compose([Validators.required, CustomValidator.underscore])], 
            password: ['',Validators.compose([Validators.required,Validators.minLength(6)])]
        });
    }

}

在这种形式下，email字段对于两个验证器都可以正常工作，即当我不键入任何内容时，它给出"Email is required"消息，当我开始键入内容时，它给出"Underscore is required"消息，并且当我键入所有错误消息消失.但是，当我尝试在password字段上应用这样的2个验证器时，它不起作用.当我不输入密码时，它将显示为"Password is required"的消息.但是，当我输入少于6个字符的字符时，根本不会出现minLength消息.这段代码有什么问题?

In this form, email field is working fine for both validators i.e. when I do not type anything , it gives "Email is required" message, when I start typing something, it gives "Underscore is required" message and when I type "_" all error messages disappears. However, when I try to apply such 2 validators on password field, it's not working. When I do not type password it gives message as "Password is required". But when I type something less than 6 characters, minLength message doesn't appear at all. What is wrong in this code?

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